nav { 
width: 100%;
}
nav ul {
list-style: none;
}
nav ul li {   
float: left;   
display: block;   
margin-right: 25px;   
}
section { 
padding-top: 35px;
float: left;
width: 100%; 
height: 400px;
padding-left: 30px;
}
header {
padding-left: 30px;
}

footer { 
clear:both; 
background-color: #ffc;
}